This battery powered egg scope (four AA batteries supplied) can accommodate any size egg. The LED light source has the advantage of being very bright while remaining cool so that prolonged observation of eggs (even very small eggs) is not harmful to the embryos inside. This innovative aid to egg candling improves the clarity and visibility of the egg and its contents by completely blocking out ambient light, slightly magnifying the image of the egg and allowing the viewer to rotate the egg smoothly as it is observed. The OvaScope can be fitted with a webcam and is ideal for demonstration purposes or classroom use. FREE SHIPPING within the continental United States!!!